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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>PHP 字符串运算符 实例 - 自学教程(runoops.com)</title>
</head>
<body>
<?php
$txt1="Hello world!";
$txt2="What a nice day!";
echo $txt1 . " " . $txt2;
?>
</body>
</html>